Mathematics
NULL
Medium
Question
The total area of the 64 small squares of a chess board is 400 cm². There is a 3 cm wide border around the chess board. What is the length of each side of the chess board?
A
17cm
B
20cm
C
23cm
D
26cm
✓ Official correct answer
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A
17cm
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B
20cm
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C
23cm
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D
26cm
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Explanation
Playing area side = √400 = 20 cm. With 3 cm border on each side, outer side = 20 + 6 = 26 cm.